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<a href="_subsets_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">//===========================================================================</span><span class="comment"></span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment">/*!</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> * </span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> *</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * \brief       Data Subsets</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * </span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * This file is part of the tutorial &quot;Creating and Using Subsets of Data&quot;.</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> * By itself, it does not do anything particularly useful.</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> * \author      T. Glasmachers</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * \date        2014</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> *</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> *</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * \par Copyright 1995-2017 Shark Development Team</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * </span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * &lt;BR&gt;&lt;HR&gt;</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"> * This file is part of Shark.</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment"> * &lt;https://shark-ml.github.io/Shark/&gt;</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"> * </span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span><span class="comment"> * Shark is free software: you can redistribute it and/or modify</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="comment"> * it under the terms of the GNU Lesser General Public License as published </span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="comment"> * by the Free Software Foundation, either version 3 of the License, or</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="comment"> * (at your option) any later version.</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="comment"> * </span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="comment"> * Shark is distributed in the hope that it will be useful,</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span><span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span><span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="comment"> * GNU Lesser General Public License for more details.</span></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span><span class="comment"> * </span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span><span class="comment"> * You should have received a copy of the GNU Lesser General Public License</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span><span class="comment"> * along with Shark.  If not, see &lt;http://www.gnu.org/licenses/&gt;.</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span><span class="comment"> *</span></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="comment"> */</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span><span class="comment">//===========================================================================</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span> </div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span><span class="preprocessor">#include &lt;<a class="code" href="_dataset_8h.html">shark/Data/Dataset.h</a>&gt;</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span><span class="keyword">using namespace </span><a class="code hl_namespace" href="namespaceshark.html" title="AbstractMultiObjectiveOptimizer.">shark</a>;</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span> </div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span><span class="preprocessor">#include &lt;<a class="code" href="_c_v_dataset_tools_8h.html">shark/Data/CVDatasetTools.h</a>&gt;</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span> </div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="preprocessor">#include &lt;<a class="code" href="_data_view_8h.html">shark/Data/DataView.h</a>&gt;</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span> </div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span> </div>
<div class="foldopen" id="foldopen00044" data-start="{" data-end="}">
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"><a class="line" href="_subsets_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">   44</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="_subsets_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>()</div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span>{</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span>    <span class="keyword">typedef</span> RealVector I;</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span>    <span class="keyword">typedef</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> L;</div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span> </div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span>    std::size_t start = 0, end = 42;</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span> </div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span>{</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span>    <a class="code hl_class" href="classshark_1_1_labeled_data.html" title="Data set for supervised learning.">LabeledData&lt;I,L&gt;</a> dataset;             <span class="comment">// our dataset</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span> </div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span>    <span class="comment">// create an indexed subset of batches</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span>    std::vector&lt;std::size_t&gt; indices;     <span class="comment">// indices of the batches to be contained in the subset</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span>    <a class="code hl_class" href="classshark_1_1_labeled_data.html" title="Data set for supervised learning.">LabeledData&lt;I,L&gt;</a> <a class="code hl_function" href="group__shark__globals.html#ga420a47af92d8da0f5e95a7d158521db9" title="Creates a subset of a DataView with elements indexed by indices.">subset</a> = dataset.<a class="code hl_function" href="group__shark__globals.html#gae0d1826d38c41637eaaf99b3813ad133" title="Fill in the subset defined by the list of indices.">indexedSubset</a>(indices);</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span> </div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span>    <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> k = 7;</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span>    <a class="code hl_class" href="classshark_1_1_labeled_data.html" title="Data set for supervised learning.">LabeledData&lt;I,L&gt;</a> remaining_batches = dataset.<a class="code hl_function" href="group__shark__globals.html#gaf0ea94e3e28b6df4e12fcbe8040293ac" title="Splits the container into two independent parts. The left part remains in the container,...">splice</a>(k);</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span> </div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span>    <a class="code hl_class" href="classshark_1_1_labeled_data.html" title="Data set for supervised learning.">LabeledData&lt;I,L&gt;</a> remaining_elements = <a class="code hl_function" href="group__shark__globals.html#gaa6e44d5e4f847777153927436e61752f" title="Removes the last part of a given dataset and returns a new split containing the removed elements.">splitAtElement</a>(dataset, k);</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span>}</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span> </div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span>    <a class="code hl_class" href="classshark_1_1_labeled_data.html">ClassificationDataset</a> data;</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span>    <span class="comment">// ...</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span>    <a class="code hl_function" href="group__shark__globals.html#ga9d96d1a2053608a9da101841d7a4feb5" title="reorders the dataset such, that points are grouped by labels">repartitionByClass</a>(data);</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span> </div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span>    std::size_t class0 = 0, class1 = 1;</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span>    <a class="code hl_class" href="classshark_1_1_labeled_data.html">ClassificationDataset</a> subproblem = <a class="code hl_function" href="group__shark__globals.html#gac9f0302f06c1f7365042a754a92a28ee">binarySubProblem</a>(data, class0, class1);</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span> </div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span>{</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span>    <a class="code hl_class" href="classshark_1_1_data_view.html" title="Constant time Element-Lookup for Datasets.">DataView&lt;ClassificationDataset&gt;</a> view(data);</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span> </div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span>    <span class="comment">// creating a random subset from indices</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span>    std::size_t k = 100;</div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span>    std::vector&lt;std::size_t&gt; indices(view.<a class="code hl_function" href="classshark_1_1_data_view.html#a71ba14d4f067dc437d6683dac9982f77">size</a>());</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span>    <span class="keywordflow">for</span> (std::size_t i=0; i&lt;view.<a class="code hl_function" href="classshark_1_1_data_view.html#a71ba14d4f067dc437d6683dac9982f77">size</a>(); i++) indices[i] = i;</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span>    <span class="keywordflow">for</span> (std::size_t i=0; i&lt;k; i++) std::swap(indices[i], indices[rand() % view.<a class="code hl_function" href="classshark_1_1_data_view.html#a71ba14d4f067dc437d6683dac9982f77">size</a>()]);</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span>    indices.resize(k);</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span>    <a class="code hl_class" href="classshark_1_1_data_view.html" title="Constant time Element-Lookup for Datasets.">DataView&lt;ClassificationDataset&gt;</a> subset1 = <a class="code hl_function" href="group__shark__globals.html#ga420a47af92d8da0f5e95a7d158521db9" title="Creates a subset of a DataView with elements indexed by indices.">subset</a>(view, indices);</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span> </div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span>    <span class="comment">// same functionality in one line</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span>    <a class="code hl_class" href="classshark_1_1_data_view.html" title="Constant time Element-Lookup for Datasets.">DataView&lt;ClassificationDataset&gt;</a> subset2 = <a class="code hl_function" href="group__shark__globals.html#ga6d5f76f9a5891a8675c3ee297d57ad48" title="creates a random subset of a DataView with given size">randomSubset</a>(view, k);</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span>}</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span> </div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span>{</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span>    std::size_t numberOfPartitions = 5;</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span>    std::vector&lt;std::size_t&gt; indices;</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span>    <span class="comment">// Creates partitions of approximately the same size.</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span>    <a class="code hl_function" href="group__shark__globals.html#gac5ab39c050dd915797e37fa421db33fd" title="Create a partition for cross validation.">createCVSameSize</a>(data, numberOfPartitions);</div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span> </div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span>    <span class="comment">// Creates IID drawn partitions of the data set (without replacement).</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span>    <a class="code hl_function" href="group__shark__globals.html#gac32dddc7b7c3eaa8779dc244c6142eef" title="Create a partition for cross validation.">createCVIID</a>(data, numberOfPartitions);</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span> </div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span>    <span class="comment">// Creates indexed cross-validation sets. For each element the</span></div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span>    <span class="comment">// index describes the fold in which the data point acts as a</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span>    <span class="comment">// validation example. This function offers maximal control.</span></div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span>    <a class="code hl_function" href="group__shark__globals.html#gaab4c1c3153591bc8ae8130df6a84c65c" title="Create a partition for cross validation from indices.">createCVIndexed</a>(data, numberOfPartitions, indices);</div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span> </div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span>    <a class="code hl_function" href="group__shark__globals.html#gabb5bec2fca9d1eaa2ea58c75d36d1195" title="Create a partition for cross validation.">createCVSameSizeBalanced</a>(data, numberOfPartitions);</div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span> </div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span>}</div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span> </div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span>{</div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span>    std::size_t numberOfPartitions = 5;</div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span>    std::size_t numberOfFolds = 3;</div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span>    <a class="code hl_class" href="classshark_1_1_c_v_folds.html">CVFolds&lt;RegressionDataset&gt;</a> folds;</div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span> </div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span>    <span class="keywordflow">for</span> (std::size_t i=0; i&lt;numberOfPartitions; i++)</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span>    {</div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span>    <span class="comment">// as created in the above example</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span>    <a class="code hl_class" href="classshark_1_1_labeled_data.html">RegressionDataset</a> training = folds.<a class="code hl_function" href="classshark_1_1_c_v_folds.html#a71a49586552161e0027348fa3a165310">training</a>(i);</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span>    <a class="code hl_class" href="classshark_1_1_labeled_data.html">RegressionDataset</a> validation = folds.<a class="code hl_function" href="classshark_1_1_c_v_folds.html#a02f53dc5f3585ac17b190bbbe9549b88">validation</a>(i);</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span>    <span class="comment">// explicit copy!</span></div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span>    training.<a class="code hl_function" href="group__shark__globals.html#ga5a4a7922424072317ec868221e19e075" title="This method makes the vector independent of all siblings and parents.">makeIndependent</a>();</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span>    <span class="comment">// creating a new fold</span></div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span>    <a class="code hl_class" href="classshark_1_1_c_v_folds.html">CVFolds&lt;RegressionDataset&gt;</a> innerFolds = <a class="code hl_function" href="group__shark__globals.html#gac5ab39c050dd915797e37fa421db33fd" title="Create a partition for cross validation.">createCVSameSize</a>(training, numberOfFolds);</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span>    }</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span>}</div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span> </div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span>}</div>
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